The trailer of thriller film Black Butterfly, which chronicles the unhinged relationship between a drifter and a screenwriter, released on 21 March, 2017, and it is dark and filled with suspense.

Youtube screengrab

The trailer opens with a conversation between a reclusive writer and a woman. "I've to admit, I'm in awe, I've never known a writer before," she says. "I haven't written in a long time," he confesses, adding that his wife has left him.

We later learn that the writer has moved into a lodge in the wilderness to write. Once when he is on his way home, he notices a drifter on the road. He gives a drifter a ride.

He offers to let the drifter stay with him, and the man begins to interfere in his life. He even reads his script. When the writer says the stories are not good enough, the drifter offers to help him.

The title of the film is a reference to a tattoo on the drifter's back which he says he got done in prison.

The trailer then takes a dark turn with the appearance of a policeman who asks if the writer has seen a woman who has gone missing, the writer finding bloodied surgical instruments and a confrontation between the lead characters. It appears that they have made an agreement of some sort where the writer allows the drifter to stay in his house; a decision he regrets because he ends up becoming "a prisoner in his own house".

The line "There is a reason you don't talk to strangers," which flashes during the trailer sums up the plot of Black Butterfly quite well.